Starting on Day 5, you will receive tacrolimus and mycophenolate mofetil (MMF) to help lower the risk of GVHD. Tacrolimus will be given by vein as a continuous infusion for about 2 weeks. After the 2 weeks of taking tacrolimus by vein, you will take tacrolimus by mouth as a pill for at least 3 months. MMF will be given by mouth, 3 times a day, usually until Day 35.